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- W2012961772 abstract "The membrane interaction properties of two single-residue variants, R6W and L5S, of the 17-amino acid neuropeptide dynorphin A (DynA) were studied by circular dichroism (CD) and nuclear magnetic resonance (NMR) spectroscopy. Corresponding gene mutations have recently been discovered in humans and causatively linked to a neurodegenerative disorder. The peptides were investigated in buffer and in isotropic solutions of q = 0.3 bicelles with 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) or DMPC (0.8) and 1,2-dimyristoyl-sn-glycero-3-phospho(1′-rac-glycerol) (DMPG) (0.2). The CD results and the NMR secondary chemical shifts show that R6W-DynA has a small α-helical fraction in buffer, which increases in the presence of bicelles, while L5S-DynA is mainly unstructured under all conditions studied here. R6W-DynA has an almost complete association with zwitterionic bicelles (∼90%, as probed by NMR diffusion experiments), similar to the behavior of wtDynA, while L5S-DynA has a weaker association (∼50%). For all peptides, the level of bicelle association is increased in negatively charged bicelles. The L5A-DynA peptide adopts a very shallow position in the headgroup region of the bicelle bilayer, as studied by paramagnetic spin relaxation enhancement experiments using paramagnetic probes. Similarly, the results show that R6W-DynA is more deeply buried in the bilayer, with only the C-terminal residues exposed to solvent, again more similar to the case of wild-type DynA. We suggest that the results presented here may explain the differences in cell toxicity of these disease-related neuropeptide variants." @default.
- W2012961772 created "2016-06-24" @default.
- W2012961772 creator A5034635485 @default.
- W2012961772 creator A5054889523 @default.
- W2012961772 creator A5060263851 @default.
- W2012961772 date "2013-06-10" @default.
- W2012961772 modified "2023-09-25" @default.
- W2012961772 title "Membrane Interaction of Disease-Related Dynorphin A Variants" @default.
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- W2012961772 doi "https://doi.org/10.1021/bi4004205" @default.
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